Does ATH-R70x need an amp?

I am considering getting the Audio Technica R70x, which have quite a high impedance (470 ohms) and sensitivity (99 dB). These go for about €300, which is more or less my budget and I don’t want to spend much more on an amp or a DAC (maybe I’d be willing to spend €100, but no more than that).

If you own these cans, what do you suggest? I want to know before buying, to avoid finding out later that I need to pay 200 extra bucks.

Thanks in advance!